292 REPORT OF NATIONAL MUSEUM, 1897. 



BOLIVINA ^NARIENSIS Costa. 

 (Plate 37, fig. 8.) 



Elongate, flattened, tapering, symmetrical ; margins sharp and 

 smooth ; apex usually terminating in a spinous process ; two or more 

 delicate perpendicular ridges extending a variable distance from the 

 apex toward the base; walls thin, transparent, minutely and profusely 

 perforated; segments very regularly arranged in two alternating 

 series; aperture loop-like at the inner margin of the last segment. 

 Length, about 0.8 mm. (g^- inch). 



Localities. — Off Cape Hatteras, Gulf of Mexico, southeast of Georges 

 Bank, south of Block Island (stations 2289, 2400, 2530, 2584), 7 to 95G 

 fathoms. 



BOLIVINA PUNCTATA d'Orbigny. 

 d'late 38, fig. 1.) 



Slender, elongate, tapering, rounded, symmetrical, slightly curved; 

 composed of a double, alternating series of segments, twelve or more 

 in each row; surface smooth and even; sutures not depressed; walls 

 thin and finely perforated; aperture ovate, oblique, on the terminal face 

 of the last segment. Length, about 0.8 mm. ( a A> inch). 



Locality. — Not recorded. 



BOLIVINA PORRECTA Brady. 

 (Plato 38, fig. 2.) 



Straight, slightly tapering, nearly cylindrical in section; earlier seg- 

 ments in opposite alternating rows, later segments triangular and 

 superposed, the sutures extending obliquely the whole breadth of the 

 test; walls very thin, transparent and finely perforated; aperture 

 large, oval, across the terminal face of the last segment. Length, 

 about 1 mm. ( 2 -V inch). 



Locality. — A single specimen from the North Atlantic, southeast of 

 Georges Bank (station 2530), 956 fathoms. 



Subfamily C^XSSIDXJLIJSTIIV^. 



Test consisting of a Textularia-like series of alternating segments, 

 more or less coiled upon itself. 



Genus CASSIDULINA. 



Test biserial, folded on its long axis, and coiled more or less com- 

 pletely on itself, 



CASSIDULINA CRASSA d'Orbigny. 

 (Plate 38, fig. 3.) 



Oval, compressed, with rounded outlines; sutural lines indistinct; 

 surface smooth; texture calcareous. Section shows the coiled cham- 

 bers of one series. Diameter, about 1 mm. {-£§ inch). 



